Combustion apparatus



Dec. 10, 1929. .R. A. FORESMAN COMBUSTION APPARATUS Filed Jan. 26, 1925 ATi bRNEY Patented Dec. 10, 1929 UNITED STATES PATENT OFFICE ROBERT A. FORESMAN, OF MOORES, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA COMBUSTION APPARATUS Application filed January 26, 1925. Serial No. 4,728.

My invention relates to refuse disposal mechanism for stokers and particularly to a form of mechanism that is adapted for use with a progressive fuel feed grate of the underfeed type and it has for an object to provide a disposal mechanism which produces complete combustion of the fuel fed to it and delivers refuse having practically no combustible matter therein. A further object of my invention is to produce a refuse disposal mechanism which will reduce to a comminuted form all large masses of clinker, thereby permitting of easy handling of the ash.

Another purpose of my invention is to produce a device of the class described which permits of movement to break up the'fuel bed resting thereon to enable air to penetrate the mass of fuel and non-combustible resting thereon.

To these ends my invention consists in the general: combination and arrangement of parts described and claimed, distinctive features being the movement of an extension grate by eccentric members on a clinker grinder roll, the supply of air to the fuel on the extension grate, the provision of a stationary member for cooperation with members carried by the clinker grinder roll and other incidental features, all as hereinafter set forth and shown in the accompanying drawings wherein Fig. 1 represents a crosssection through a refuse disposal mechanism as applied to an underfeed stoker of the conventional type, and Fig. 2 is a plan view of the mechanism shown in Fig. 1 drawn'to a small er scale than Fig. 1.

In the drawings, 10 represents my refuse disposal mechanism as applied to the lower end of the grate 11, which is of any old and well known type and is not further described herein. The lower end of the grate 11 is supported upon channel beams 12. Extending from the channel beams 12 to channel beams 13-13 are a plurality of longitudinal members 14 carrying bearings 17 for a shaft 16. Caps 15 form the upper part of the bearings and are secured to the members 14 as by bolts 19 and 21. Secured to the shaft 16 are a number of 50 diamond shaped members 22 which rotate with the shaft for a purpose to be more fully described hereafter. Extending between adjacent members 22 are pivot rods 23 carrying rolls 2424.

Secured to the lower end of the grate 11 as by bolts 28, is a bearing member 27 having hook shaped portions 31 and 32 to carry upper and lower sections of an extension grate 29. The lower section 33 is provided with a recess 34 for engagement with the hook shaped member 31, thus avoiding any necessity for an opening in this part of the lower section. The lower section 33 is provided with a bearing surface 36 upon which one end of the upper section 38 rests. The upper section 38 is provided with a cylindrical portion 41 for engagement with the hook shaped member 32. This member lies largely beneath the upper section 38 whereby it is possible to avoid any holes at this point. As a result of this construction the lower section 33 and the upper section 38 cover a closed chamber 43 which is supplied with air from any convenient source. The sections of the extension grate 29 are provided with tuyere plates 44 and 45 whereby air is admitted to the mass of fuel and non-combustible resting thereupon.

The lower section 33 is provided with a number of spaced extensions 48 at its lower edge. The lower part of the extensions 48 have bearing surfaces 49 for engagement with the rolls 24 carried between the eccentric members 22 previously described. Upon the rotation of the shaft 16, the rolls 24 engage the surface 49 and impart a vertical oscillating movement to the lower section 33 of the dump grate 29. As the upper section 38 bears upon the surface 36 of the lower section, it is evident that the upper section also oscillates upon rotation of the shaft 16.

Mounted on the shaft 16 are a plurality of hook shaped members 52-52 which extend between the extensions 48 of the lower section 33. Opposite the shaft 16 are a plurality of spaced members 54 which are so spaced that the members 5252 can rotate between adjacent members. The members 54 are supported by the channel beams 1313. To the rear of the members 54 is a dump grate 61 of any conventional type supported from the wall 62 in any convenient manner.

In the operation of my device the fuel is fed downwardly over the grate 11 and discharged on to the extension grate 29. The shaft 16 is rotated in a counter-clockwise di- 'rection by any suitable means. During the rotation, the eccentric member 22and the rolls 24 engage the bearing surface 49 of the lower section of the extension grate, causing it to oscillate. The oscillation of the lower section is transmitted to the upper section through the bearing surface 36. As a result there is a relative motion between the upper and lower sections of the extension grate, causing a breaking up of masses of clinker or other forms of consolidated refuse thereon. At the same time, air is discharged into this refuse, securing substantially complete combustion of the fuel thereon. Oscillation of the grate discharges the refuse onto the extensions as where it is broken up bythemtating members 552-, cooperating with the sta tionary members 54 and discharged to a refuse pit. Any'large mass of refuse will be forced rearwardly onto the dump grate 61 which may be operated periodically.

It will be observed that I have disclosed my invention as beingapplied to the discharge end of a progressive uuderfeed grate section of the multiple retort type. However, in so far as certain aspects of my invention are concerned, it is not so limited, for it might equally as well be applied to any type of progressive fuel feed grate, such for instance as to the lateral walls of a single retort,

' or still further it might be applied to the discharge of an overfeed grate.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but issusceptible of various other changes and modifications without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in theappended claims.

What I claim is:

1. In combinationwith a progressive fuel feed furnace having an oscillating extension grate member, a revoluble shaft carrying eccentric members adapted to act upon said grate member, whereby said grate member is oscillated, said shaft being provided with members for engaging the material on said grate, and a second oscillating grate member mounted above the oscillating extension grate member and having one end sliding on said oscillating extension grate member.

2. In combination with a progressive fuel feed furnace, a slotted extension grate formed in two sections each being pivotally mounted in said furnace and one end of one of the sections being slidingly supported by the other section, a revoluble shaft, said shaft carrying members for moving said grate and hook shaped members moving in the slotted extension.

3. In combination with a progressive fuel feed grate, an extension grate formed in two movablesections each section being pivotally mounted on the end of the progressive fuel feed grate, one end of the upper section sliding on the lower section during movement of the sections about the pivots.

4. In combination witli'a progressive fuel feed grate, an extension grate formed in two sections, each section being pivotally mounted on the end of the progressive fuel feed grate, and means for moving said extension grate, one end of the upper section sliding on the lower section during movement of the sections about the pivots.

5. In combination with a progressive fuel feed grate, an extension grate formed in two sections with one sectionoverlying the other and each section being pivotally mounted on the end of the progressive fuel feed grate, and an eccentric rotatable member adapted to engage said lower sectionto move it about its pivot.

6. In an extension grate for a stolrer, the combination with a progressive fuel feed grate having a stationary member at one end thereof, of a lower member pivotally secured a to said stationary end member, an upper member pivotally secured to 'saidstationary end member and operatively engaging said lower member and'means for moving said lower member. r

7. In an extension grate for astoker, the combination with a progressive fuel feed grate having a stationary member at one'end thereof, of a lower member pivotally secured to said, stationary end member, an upper member pivotally secured to said stationary end member and'operatively engaging said lower member, ashaft carrying eccentric portions for engaging said lower member,said shaft also carrying means for crushing refuse on .said' extension grate.

'8. In a refuse disposal mechanism for a stoker of. the progressive fuel feed type having a fixed portion adjacentthe refuse disposal mechanism, a slotted extension grate pivotally mounted on said fixed portion, a rotatable shaftbelow said extension grate, saidshaft having eccentric portions for engagement with said extension grate and members on said shaft adapted to move through the slots of the extension grate, and a slotted stationary member positioned to cooperate with said last-named members.

9. .In a refuse discharge mechanism for a progressive feed stolrer, a rotary shaft having alternate eccentric and refuse breaking members mounted thereon, an extension grate member having a slotted encportion sup ported by the rotary shaft and bearing on the eccentric members whereby oscillatorvmotion is imparted thereto upon rotation of the shaft and the refuse breaking members in rotation pass through the slots in the end of the extension grate member, a stationary member at the rear of the progressive feed section, a pivotal connection between the other end of the extension grate member and the stationary member, a second extension grate member mounted above the first men tioned extension grate member and having one end slidingly supported thereby, and a pivotal connection between the other end of the last mentioned member and the stationary member.

10. In a refuse disposal mechanism for a progressive feed stoker, a stationary member at the rear of the stoker, a rotary shaft, eccentric members carried by the shaft and spaced at intervals thereon, refuse breaking elements mounted on the shaft and alternating with the eccentric members, an extension grate member provided with slotted end riding on the eccentric members with the slots opposite the refuse breaking elements, a pivotal connection between the extension grate member and the stationary member, and a second grate member having one end p-ivotally connected to the stationary member above the first mentioned extension grate member and having its other end slidingly supported on said member.

11. A refuse discharge mechanism in a progressive feed furnace comprising a stationary member at the rear of the progressive feed section, an extension grate member having one end pivotally connected to the stationary member, a second extension grate member pivotally mounted on the stationary member beneath the first mentioned member and extending rearwardly beyond said member, said second extension grate member having its rearward end slotted, a rotary shaft supporting the slotted end of the second grate member, eccentric members carried by the rotary shaft for imparting an oscillatory move ment to the second grate member, and hook like refuse breaking members carried by the shaft and moving through the slots in the second grate member when the shaft is rotated.

12. In a furnace the combination with a progressive fuel feed stoker section, and an extension grate comprising an overfeed grate section arranged at the discharge of said firstnamed section, of a clinker grinder arranged closely adjacent the discharge end of the overfeed section; said clinker grinder comprising a rotatably mounted shaft arranged transversely of the overfeed section, grinding members secured to said shaft and extending into the fuel bed, stationary members cooperating with said grinding members, and means for rotating said shaft whereby the solid products of combustion in the fuel bed are ground between the grinding members and cooperating stationary members and discharged from the furnace; and a dump grate arranged adjacent the rear of the clinker grinders and for discharging the remaining solid products of combustion.

13. In a furnace, the combination with a progressive fuel feed stoker section and an extension grate comprising an overfeed grate section arranged adjacent the discharge of the first section and including relatively movable members for breaking up the clinker formations; of a clinker grinder arranged closely ad acent the discharge end of the overfeed section; said clinker grinder comprising a rotatably mounted shaft arranged transversely of the overfeed sect-ion, grinding members secured to said shaft and extending into the fuel bed, stationary members cooperating with said grinding members, and means for rotating said shaft whereby the solid products of combustion in the fuel bed are ground between the grinding members and cooperating stationary members and dis charged from the furnace; and a dump grate arranged adjacent the rear of the clinker grinders for dischargin the remaining solid products of combustion.

1. In a stoker the combination with a progressive fuel feed stoker section; of an extension grate arranged at the discharge end of the progressive feed stoker section, sail extension grate comprising a pair of relatively movable grate members arranged one above the other, the lower grate member extending rearwardly and beyond the upper grate member and the upper grate member being slidably supported at its lower end by the lower grate member, means for pivotally supporting the forw rd ends of both said grate members in spaced relation; and means for movingthe grate members about their pivotal support.

In testimony whereof, I have hereunto subscribed my name this sixteenth day of Jan uarv 1925.

" ROBERT A. FORESMAN. 

